See this post for related discussion 

https://travel.stackexchange.com/questions/134957/how-seriously-should-i-take-size-and-weight-limits-of-hand-luggage/134960#134960

I'm interested in hearing anecdotal evidence from a specific airline and airport.

Flying KLM

AMS Schiphol ---> JFK NYC

Is there any precedent of KLM weighing carry-on bags at Schiphol? I am planning to put my textbooks in my backpack to decrease the weight of my checked luggage to its acceptable limit.